JPH0217860Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a molding die, and in particular, an object of the present invention is to provide a molding die that has good adhesion and can prevent the formation of burrs during molding.

Conventional molds for producing foam molded products such as urethane foam cannot have a smooth surface on the mating surfaces of the upper and lower molds, making it impossible to obtain molds with excellent adhesion. Therefore, when a foaming stock solution is poured into the mold, during the foaming process, the stock solution inevitably leaks from the mating surfaces, forming unnecessary protruding parts commonly called burrs.

Therefore, after molding, these burrs must be removed using scissors, cutters, etc., which requires complicated operations and wastes raw materials, and there has been a desire to improve this. .

The present invention was developed as a result of intensive research in view of the current situation and the discovery of a molding die that does not generate burrs during molding. That is, the present invention provides a convex protrusion on the upper mold and a groove on the lower mold at relative positions of the mating surfaces of the upper mold and the lower mold, and injects aluminum powder and glass into the epoxy resin into the groove. A filler mixed with powder is filled so as to be able to fit into the protrusion, and the filler is solidified.

The reason why epoxy resin is used as the filler in the present invention is that it has high hardness and excellent heat resistance, and is also easily hardened by heating after filling. The reason for adding aluminum powder is to improve the thermal conductivity of the filler, and the addition of glass powder also provides the filler with excellent heat resistance.

The amounts of the aluminum powder and glass powder to be added are not particularly limited, but preferably 20 to 60 parts by weight of aluminum powder and 100 to 400 parts by weight of glass powder per 100 parts by weight of epoxy resin.

The reason is that if the aluminum powder is less than 20 parts by weight or the glass powder is less than 100 parts by weight, the heat resistance and thermal conductivity will be poor, making it unsuitable for long-term use.
Also, 60 parts by weight of aluminum powder and 400 parts by weight of glass powder.
This is because if the amount exceeds the weight part, the adhesion with the mold will deteriorate and the product will become dry.

The diameters of the aluminum powder and glass powder are preferably fine, and are usually about 100 to 150 meshes.

A suitable amount of a curing agent such as an amine compound may also be added to the filler.

In addition, the shape of the groove provided on the lower mold may be about 2 to 5 mm in depth and 2 to 5 mm in width, and the shape of the convex projection provided on the upper mold is also not particularly limited.
Too sharp angles are not preferred.

Next, one embodiment of the present invention will be described in detail based on the drawings.

Fig. 1 shows a molding die of the present invention, which is composed of an upper die 1 and a lower die 2, and the mating surface A of the two has a convex shape on the upper die 1 as shown in Fig. 2. A lower mold 2 in which a protrusion 3 is integrally formed and receives the protrusion 3
A concave groove 4 is provided in the concave groove, and epoxy resin 100 is filled in the concave groove.
The filler 5 is filled with 40 parts by weight of aluminum powder and 150 parts by weight of glass powder.

Next, by pushing the protrusion 3 into the groove 4, the shape of the filler 5 matches the outer peripheral surface of the protrusion, so the filler is hardened by separating the lower and upper molds and leaving them as they are for a short time. and is fixed to the groove portion 4 to form a concave groove portion.

Thereafter, a desired stock solution, such as a foaming stock solution, is poured into the lower mold and heated together with the upper mold, whereby the stock solution foams and a molded product is obtained.

According to the present invention, the projections and grooves are fitted on the mating surfaces of the upper mold and the lower mold through the filler, so that the liquid does not leak from the mating surfaces, and therefore burrs are prevented. There is no such thing as forming.

Note that the shape of the groove may be curved as shown in FIG. 3, and in this case also, the filling material is provided in the same manner as described above.

As detailed above, according to the present invention, no burrs are generated on the molded product, so there is no need for a burr removal operation, the molded product has a beautiful appearance, and it is possible to save raw materials and other remarkable effects. have

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of the mold forming die of the present invention, and FIGS. 2 and 3 are cross-sectional views showing examples of the groove portion in the mold forming die of the present invention. 1... Upper mold, 2... Lower mold, 3... Convex projection,
4...Concave groove portion, 5...Filling material.

Claims (1)

[Scope of utility model registration request] A convex protrusion is provided on the upper mold and a groove is provided on the lower mold at the relative positions of the mating surfaces of the upper mold and the lower mold, and aluminum powder and glass powder are mixed with epoxy resin in the groove. A molding die made by filling a filler so that it can fit into the protrusion and solidifying the filler.